A. I have not examined the code, but a 'PM' is a 'POST' operation (just a very special type of Post), so I will not be surprised if the Speed Limit applying is is the case. Just as a note - effectively - almost all 'submissions' in most scripts are actually post operations using 'forms'. This is a braod generalization, but in YaBB it is the case.

Yes.Obviously something I don't understand though! Does that setting prevent the first posting for the specified time? That's what it appears to do to PMs ie can't send until after 5mins if the value is set to 300.

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Have you tried either de-activating that control, or varying the value to confirm your suspicions?

Both and determinately the cause.

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C. oldbrad, could you please add that YaBB version info to your profile